K.C.S.E Biology Q & A - MODEL 2008PP1QN20
what is a single circulatory system
ANSWERS
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K.C.S.E Biology Q & A - MODEL 2008PP1QN19
The diagram below represents a tissue obtained from an animal
(a) Identify the tissue
(b) State the functions of the tissue named ( a) above
ANSWERS
(a) Cardiac muscle
(b) Contraction of the heart
K.C.S.E Biology Q & A - MODEL 2008PP1QN18
How is the epidermis of a leaf of a green plant adapted to its function
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN17
Account for the following phases of a sigmoid curve of a growth of an organism
(a) Lag phase (b) Plateau phase
ANSWERS
(a) Few dividing cells/ cells not adjusted to surrounding environment
(b) Most cells fully differentiated/ rate of cell division equals rate of cells dying K.C.S.E Biology Q & A - MODEL 2008PP1QN16
The diagram below represents a set up that was used to investigate certain process in a plant
(a) State the process that was being investigated
(b) State a factor that would affect the process
ANSWERS
(a) Photosynthesis
(b) Carbon (iv) Oxide/ Temp/ chlorophyll
K.C.S.E Biology Q & A - MODEL 2008PP1QN15
Explain what happens when there is oxygen debt in human muscles
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN14
Describe the three characteristics of a population
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN13
State two characteristics of the image formed on the retina
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN13
Name the part of retina where image is formed
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN12
State two functions of the endoplasmic reticulum
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN11
Name three processes in the human body in which homeostasis is Involved
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN11
What is homeostasis?
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
State the adaptation that enables the red blood cells to move in blood Capillaries
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
Name the antigens that determine human blood groups
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN09
Give three factors that determine the amount of energy a human being require in a day
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN08
The diagram below shows a stage in mitosis in a plant cell
(a) Name the stage of mitosis
(b) Give two reasons for your answer in (a) above (c) Name the part of the plant from which the cell used in preparation was Obtained
ANSWERS
(a) Anaphase
(b) Chromatids fails to separate off poles Sister chromatids separate/ pair of chromatid separate (c) Root tip/ shoot/ cambium
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
How does convergent evolution occur
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
what is fossil
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN06
Give two examples of continuous variation in humans
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN06
What is meant by non- disjunction?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN05
(a) State two factors that affect enzymatic activities
(b) Explain how one of the factors stated in (a) above affects enzymatic Activities
ANSWERS
(a) Temperature PH co- factors, co- enzymes; enzyme product concentration; substance concentration/ metabolic poison
(b) Temperature- increase in temperature increases rate of enzymatic activity upto an optimum/ low temperature increases enzymatic activity/ too high temp about optimum point denatures enzymes/ enzymatic activity occur at optimum temp. Ph- Enzymes work best at optimum ph/ or extreme for ph denatures enzymes. Enzyme con – Increase in con increase enzymatic activity occur at optimum temperature Co- enzymes – denatures enzymes increasing rate of activity Strate/ enzyme cone- increase in concentration increase enzymatic activity upto certain level. K.C.S.E Biology Q & A - MODEL 2008PP1QN04
The diagrams below show a red blood cell that was subjected to a certain Treatment
(a) Account for shape of the cell at the end of the experiment
(b) Draw a diagram to illustrate how a plant cell would appear if subjected to the same treatment K.C.S.E Biology Q & A - MODEL 2008PP1QN03
State the causative agent of:
(i) Cholera (ii) Candidiasis
ANSWERS
(i) Vibria chlerae
(ii) Canida/ candida albinism
K.C.S.E Biology Q & A - MODEL 2008PP1QN03
Name a disease of the liver whose symptom is jaundice
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN02
State the importance of the following processes that take place in the nephrons of a human kidney
(a) Ultra filtration (b) Selective reabsorption
ANSWERS
(a) To remove toxic/ harmful substances/ urea nitrogenous waste from the blood streams
(b) To return useful substances/ glucose and Amino acids loose into the Bloodstream. |
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